When we first got Charlie he had a couple of pink patches just in front of his arm pits. When we took him to the vet for his 'MOT'

and showed him this he told us that this was more than likely due to excess oil that was being produced because of his weight - he said that this should go when his weight had reduced. He did give us some anti bacterial shampoo, but to be honest it is neither use nor ornament.
I have got his weight down to what I think is reasonable, although I admit there is still a little bit to go, but the itchy patches are getting worse and he seems to be licking then which is making the skin / fur around it pink.
I had considered (before he came to us) that it may have been boredom, but I doubt this is the case now.
My mum suggests giving him piriton to see if that works - I was wondering if there was any solution or cream that I could try on him
Thanks